I wonder whether baseball is still broadcast on shortwave. I remember my grandfather listening to the Yankees at stupid o'clock on (I think) Armed Forces Radio SW in Bangkok. That was shortly after South Vietnam fell and there were still loads of US military all over SE Asia and no interwebz.

Hard to manage a double header when there's a 4:00 game already scheduled,

Typically, if there is a 4pm game, and they really want a doubleheader, it's a traditional doubleheader with the 4pm ticket holders getting both games. Second game might start a bit late but they don't complain because they are getting a free game. Depends on how much management wants to get the game in, because they lose a gate, but on the other hand it's good for fan morale. I've twice been the recipient of a free game in this manner.Of course then the complication becomes what happens to the tickets for the rained out game, since there is no makeup. In the past, they have offered to simply refund in full. I don't know .if they would still do that

Typically, if there is a 4pm game, and they really want a doubleheader, it's a traditional doubleheader with the 4pm ticket holders getting both games. Second game might start a bit late but they don't complain because they are getting a free game. Depends on how much management wants to get the game in, because they lose a gate, but on the other hand it's good for fan morale. I've twice been the recipient of a free game in this manner.Of course then the complication becomes what happens to the tickets for the rained out game, since there is no makeup. In the past, they have offered to simply refund in full. I don't know .if they would still do that

The chance of rain does not rise above 50% until 7 or above 60% until 9 (at which point it is 90% but drops after that). I'm guessing that they will start the game, delay it if necessary in the middle, then wait as long as necessary (within reason) to resume. But if they've played enough to make it official (which would be likely by 9), they'll just end it. Look for them to do everything within their power to get it started on time; that's a clue that this is the plan.